My customer wants a different Invoice ID numbering.
A sequence based on year and contribution type.
So, something like Event-2015-001 Event-2015-002 .. Event-2015-156 Event-2016-001 Memb-2015-001 Memb-2015-002 .. Memb-2015-129 Memb-2016-001
How would you approach that? What are the (unwanted) side-effects?
The invoices are generated by CiviCRM (so not an external source of the Invoice ID). The invoice ID's will be used by a financial package.
Thanks for the answers. After I showed the customer that Invoice ID's were adjustable with Batch Update Contributions via Profile they want to use that for now. Maybe later we will automate it.